.option headers_add routers list&!! unset
.cindex "header lines" "adding"
.cindex "router" "adding header lines"
-This option specifies a list of text headers, newline-separated,
+This option specifies a list of text headers,
+.new
+newline-separated (by default, changeable in the usual way),
+.wen
that is associated with any addresses that are accepted by the router.
Each item is separately expanded, at routing time. However, this
option has no effect when an address is just being verified. The way in which
.option headers_remove routers list&!! unset
.cindex "header lines" "removing"
.cindex "router" "removing header lines"
-This option specifies a list of text headers, colon-separated,
+This option specifies a list of text headers,
+.new
+colon-separated (by default, changeable in the usual way),
+.wen
that is associated with any addresses that are accepted by the router.
Each item is separately expanded, at routing time. However, this
option has no effect when an address is just being verified. The way in which
.option headers_add transports list&!! unset
.cindex "header lines" "adding in transport"
.cindex "transport" "header lines; adding"
-This option specifies a list of text headers, newline-separated,
+This option specifies a list of text headers,
+.new
+newline-separated (by default, changeable in the usual way),
+.wen
which are (separately) expanded and added to the header
portion of a message as it is transported, as described in section
&<<SECTheadersaddrem>>&. Additional header lines can also be specified by
.option headers_remove transports list&!! unset
.cindex "header lines" "removing"
.cindex "transport" "header lines; removing"
-This option specifies a list of header names, colon-separated;
+This option specifies a list of header names,
+.new
+colon-separated (by default, changeable in the usual way);
+.wen
these headers are omitted from the message as it is transported, as described
in section &<<SECTheadersaddrem>>&. Header removal can also be specified by
routers.
.cindex "cutthrough" "requesting"
This option requests delivery be attempted while the item is being received.
-The option usable in the RCPT ACL.
+The option is usable in the RCPT ACL.
If enabled for a message recieved via smtp and routed to an smtp transport,
-and the message has only one recipient,
+and only one transport, interface, destination host and port combination
+is used for all recipients of the message,
then the delivery connection is made while the receiving connection is open
and data is copied from one to the other.
+An attempt to set this option for any recipient but the first
+for a mail will be quietly ignored.
If a recipient-verify callout connection is subsequently
-requested in the same ACL it is held open and used for the data,
+requested in the same ACL it is held open and used for
+any subsequent receipients and the data,
otherwise one is made after the initial RCPT ACL completes.
Note that routers are used in verify mode,
Cutthrough delivery is not supported via transport-filters or when DKIM signing
of outgoing messages is done, because it sends data to the ultimate destination
before the entire message has been received from the source.
+It is not supported for messages recieved with the SMTP PRDR option in use.
Should the ultimate destination system positively accept or reject the mail,
a corresponding indication is given to the source system and nothing is queued.
If there is a temporary error the item is queued for later delivery in the
usual fashion. If the item is successfully delivered in cutthrough mode
-the log line is tagged with ">>" rather than "=>" and appears
+the delivery log lines are tagged with ">>" rather than "=>" and appear
before the acceptance "<=" line.
Delivery in this mode avoids the generation of a bounce mail to a
address, and in that case, the subsequent value of &$address_data$& is the
value for the child address.
-.vitem &*verify&~=&~reverse_host_lookup*&
+.vitem &*verify&~=&~reverse_host_lookup/*&<&'options'&>
.cindex "&%verify%& ACL condition"
.cindex "&ACL;" "verifying host reverse lookup"
.cindex "host" "verifying reverse lookup"
one of its aliases, does, when it is itself looked up in the DNS, yield the
original IP address.
+There is one possible option, &`defer_ok`&. If this is present and a
+DNS operation returns a temporary error, the verify condition succeeds.
+
If this condition is used for a locally generated message (that is, when there
is no client host involved), it always succeeds.
.endd
-.section "Scanning with SpamAssassin" "SECTscanspamass"
+.section "Scanning with SpamAssassin and Rspamd" "SECTscanspamass"
.cindex "content scanning" "for spam"
.cindex "spam scanning"
.cindex "SpamAssassin"
+.cindex "Rspamd"
The &%spam%& ACL condition calls SpamAssassin's &%spamd%& daemon to get a spam
-score and a report for the message. You can get SpamAssassin at
-&url(http://www.spamassassin.org), or, if you have a working Perl
-installation, you can use CPAN by running:
+score and a report for the message.
+.new
+Support is also provided for Rspamd (which can speak SpamAssassin's protocol but
+provides reduced functionality when used in this mode).
+
+For more information about installation and configuration of SpamAssassin or
+Rspamd refer to their respective websites at
+&url(http://spamassassin.apache.org) and &url(http://www.rspamd.com)
+.wen
+
+SpamAssassin can be installed with CPAN by running:
.code
perl -MCPAN -e 'install Mail::SpamAssassin'
.endd
nicely, however.
.oindex "&%spamd_address%&"
-After having installed and configured SpamAssassin, start the &%spamd%& daemon.
-By default, it listens on 127.0.0.1, TCP port 783. If you use another host or
-port for &%spamd%&, you must set the &%spamd_address%& option in the global
-part of the Exim configuration as follows (example):
+By default, SpamAssassin listens on 127.0.0.1, TCP port 783 and if you
+intend to use an instance running on the local host you do not need to set
+&%spamd_address%&. If you intend to use another host or port for SpamAssassin,
+you must set the &%spamd_address%& option in the global part of the Exim
+configuration as follows (example):
.code
spamd_address = 192.168.99.45 387
.endd
-You do not need to set this option if you use the default. As of version 2.60,
-&%spamd%& also supports communication over UNIX sockets. If you want to use
-these, supply &%spamd_address%& with an absolute file name instead of a
-address/port pair:
+
+.new
+To use Rspamd (which by default listens on all local addresses
+on TCP port 11333)
+you should add &%variant=rspamd%& after the address/port pair, for example:
+.code
+spamd_address = 127.0.0.1 11333 variant=rspamd
+.endd
+.wen
+
+As of version 2.60, &%SpamAssassin%& also supports communication over UNIX
+sockets. If you want to us these, supply &%spamd_address%& with an absolute
+file name instead of an address/port pair:
.code
spamd_address = /var/run/spamd_socket
.endd
You can have multiple &%spamd%& servers to improve scalability. These can
reside on other hardware reachable over the network. To specify multiple
&%spamd%& servers, put multiple address/port pairs in the &%spamd_address%&
-option, separated with colons:
+option, separated with colons (the separator can be changed in the usual way):
.code
spamd_address = 192.168.2.10 783 : \
192.168.2.11 783 : \
192.168.2.12 783
.endd
-Up to 32 &%spamd%& servers are supported. The servers are queried in a random
-fashion. When a server fails to respond to the connection attempt, all other
+Up to 32 &%spamd%& servers are supported.
+When a server fails to respond to the connection attempt, all other
servers are tried until one succeeds. If no server responds, the &%spam%&
condition defers.
-&*Warning*&: It is not possible to use the UNIX socket connection method with
-multiple &%spamd%& servers.
+.new
+Unix and TCP socket specifications may be mixed in any order.
+Each element of the list is a list itself, space-separated by default
+and changeable in the usual way.
+
+For TCP socket specifications a host name or IP (v4 or v6, but
+subject to list-separator quoting rules) address can be used,
+and the port can be one or a dash-separated pair.
+In the latter case, the range is tried in strict order.
+
+Elements after the first for Unix sockets, or second for TCP socket,
+are options.
+The supported option are:
+.code
+variant=rspamd Use Rspamd rather than SpamAssassin protocol
+time=<start>-<end> Use only between these times of day
+tmo=<timespec> Connection time limit.
+weight=<value> Selection bias
+backup Use only if all non-backup servers fail
+.endd
+
+Time specifications for the &`time`& option are <hour>.<minute>.<second>
+in the local time zone; each element being one or more digits.
+Either the seconds or both minutes and seconds, plus the leading &`.`&
+characters, may be omitted and will be taken as zero.
+
+Timeout specifications for the &`tmo`& option are the usual Exim
+time interval standard, eg. &`20s`& or &`1m`&.
+The default value is two minutes.
+
+Servers are queried in a random fashion, weighted by the selection bias.
+The default value for selection bias is 1.
+.wen
The &%spamd_address%& variable is expanded before use if it starts with
a dollar sign. In this case, the expansion may return a string that is
relevant if you have set up multiple SpamAssassin profiles. If you do not want
to scan using a specific profile, but rather use the SpamAssassin system-wide
default profile, you can scan for an unknown name, or simply use &"nobody"&.
-However, you must put something on the right-hand side.
+.new
+Rspamd does not use this setting. However, you must put something on the
+right-hand side.
+.wen
The name allows you to use per-domain or per-user antispam profiles in
principle, but this is not straightforward in practice, because a message may
.vitem &$spam_report$&
A multiline text table, containing the full SpamAssassin report for the
message. Useful for inclusion in headers or reject messages.
+
+.new
+.vitem &$spam_action$&
+For SpamAssassin either 'reject' or 'no action' depending on the
+spam score versus threshold.
+For Rspamd, the recommended action.
+.wen
+
.endlist
The &%spam%& condition caches its results unless expansion in
git://git.exim.org / users / jgh / exim.git / blobdiff